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SubjectRe: [patch 3/3] clockevent driver for arm/pxa2xx
Add a clockevent driver for pxa systems. This patch also removes the pxa
dyntick support since it is not necessary anymore with generic dynamic
tick support

Signed-off-by: Luotao Fu <lfu@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

---
arch/arm/mach-pxa/time.c | 106 ++++++++++++++++++++++-------------------------
1 file changed, 51 insertions(+), 55 deletions(-)
Index: arch/arm/mach-pxa/time.c
===================================================================
--- a/arch/arm/mach-pxa/time.c.orig
+++ b/arch/arm/mach-pxa/time.c
@@ -19,6 +19,7 @@
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/clocksource.h>
+#include <linux/clockchips.h>

#include <asm/system.h>
#include <asm/hardware.h>
@@ -29,6 +30,50 @@
#include <asm/mach/time.h>
#include <asm/arch/pxa-regs.h>

+static u32 clockevent_mode = 0;
+
+static void pxa_set_next_event(unsigned long evt,
+ struct clock_event_device *unused)
+{
+ OSMR0 = OSCR + evt;
+}
+
+static void pxa_set_mode(enum clock_event_mode mode, struct clock_event_device *evt)
+{
+ switch (mode) {
+ case CLOCK_EVT_PERIODIC:
+ case CLOCK_EVT_ONESHOT:
+ OIER |= OIER_E0;
+ break;
+
+ case CLOCK_EVT_SHUTDOWN:
+ OIER &= ~OIER_E0;
+ return;
+ }
+ clockevent_mode = mode;
+}
+
+static struct clock_event_device clockevent_pxa = {
+ .name = "pxa_timer1",
+ .capabilities = CLOCK_CAP_NEXTEVT | CLOCK_CAP_TICK |
+ CLOCK_CAP_UPDATE | CLOCK_CAP_PROFILE,
+ .shift = 32,
+ .set_mode = pxa_set_mode,
+ .set_next_event = pxa_set_next_event,
+};
+
+static int __init pxa_clockevent_init(void)
+{
+ clockevent_pxa.mult = div_sc(CLOCK_TICK_RATE, NSEC_PER_SEC,
+ clockevent_pxa.shift);
+ clockevent_pxa.max_delta_ns =
+ clockevent_delta2ns(0xfffffffe, &clockevent_pxa);
+ clockevent_pxa.min_delta_ns =
+ clockevent_delta2ns(0xf, &clockevent_pxa);
+ register_local_clockevent(&clockevent_pxa);
+
+ return 0;
+}

static inline unsigned long pxa_get_rtc_time(void)
{
@@ -49,25 +94,11 @@ static int pxa_set_rtc(void)
return 0;
}

-#ifdef CONFIG_NO_IDLE_HZ
-static unsigned long initial_match;
-static int match_posponed;
-#endif
-
static irqreturn_t
pxa_timer_interrupt(int irq, void *dev_id)
{
int next_match;

- write_seqlock(&xtime_lock);
-
-#ifdef CONFIG_NO_IDLE_HZ
- if (match_posponed) {
- match_posponed = 0;
- OSMR0 = initial_match;
- }
-#endif
-
/* Loop until we get ahead of the free running timer.
* This ensures an exact clock tick count and time accuracy.
* Since IRQs are disabled at this point, coherence between
@@ -85,13 +116,15 @@ pxa_timer_interrupt(int irq, void *dev_i
* exactly one tick period which should be a pretty rare event.
*/
do {
- timer_tick();
+ clockevent_pxa.event_handler();
OSSR = OSSR_M0; /* Clear match on timer 0 */
+
+ if (clockevent_mode != CLOCK_EVT_PERIODIC)
+ break;
+
next_match = (OSMR0 += LATCH);
} while( (signed long)(next_match - OSCR) <= 8 );

- write_sequnlock(&xtime_lock);
-
return IRQ_HANDLED;
}

@@ -141,44 +174,10 @@ static void __init pxa_timer_init(void)
clocksource_pxa.mult =
clocksource_hz2mult(CLOCK_TICK_RATE, clocksource_pxa.shift);
clocksource_register(&clocksource_pxa);
-}
-
-#ifdef CONFIG_NO_IDLE_HZ
-static int pxa_dyn_tick_enable_disable(void)
-{
- /* nothing to do */
- return 0;
-}
-
-static void pxa_dyn_tick_reprogram(unsigned long ticks)
-{
- if (ticks > 1) {
- initial_match = OSMR0;
- OSMR0 = initial_match + ticks * LATCH;
- match_posponed = 1;
- }
-}

-static irqreturn_t
-pxa_dyn_tick_handler(int irq, void *dev_id)
-{
- if (match_posponed) {
- match_posponed = 0;
- OSMR0 = initial_match;
- if ( (signed long)(initial_match - OSCR) <= 8 )
- return pxa_timer_interrupt(irq, dev_id);
- }
- return IRQ_NONE;
+ pxa_clockevent_init();
}

-static struct dyn_tick_timer pxa_dyn_tick = {
- .enable = pxa_dyn_tick_enable_disable,
- .disable = pxa_dyn_tick_enable_disable,
- .reprogram = pxa_dyn_tick_reprogram,
- .handler = pxa_dyn_tick_handler,
-};
-#endif
-
#ifdef CONFIG_PM
static unsigned long osmr[4], oier;

@@ -213,7 +212,4 @@ struct sys_timer pxa_timer = {
.init = pxa_timer_init,
.suspend = pxa_timer_suspend,
.resume = pxa_timer_resume,
-#ifdef CONFIG_NO_IDLE_HZ
- .dyn_tick = &pxa_dyn_tick,
-#endif
};
--
Dipl.-Ing. Sascha Hauer | http://www.pengutronix.de
Pengutronix - Linux Solutions for Science and Industry
Handelsregister: Amtsgericht Hildesheim, HRA 2686
Hannoversche Str. 2, 31134 Hildesheim, Germany
Phone: +49-5121-206917-0 | Fax: +49-5121-206917-9
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